There are many ways to estimate obesity, and Body Mass Index (BMI) is a relatively accurate method that is widely accepted and adopted around the world for diagnosis. By dividing your weight in kilograms by the square of your height, you can determine your BMI. For example, if you weigh 70 kilograms and are 1.7 meters tall, your BMI = 70 ÷ (1.7 × 1.7) = 24. This is better than simply weighing yourself on a scale because it also takes height into account. Now that you've learned how to calculate BMI, let's take a look at the relationship between "Body Mass Index" and "Health Risks": A BMI between 18-25 indicates average health risks; a BMI between 25-30 indicates that health risks start to increase; a BMI between 30-35 indicates higher health risks; a BMI between 35-40 indicates very high health risks; and a BMI greater than 40 indicates extremely high health risks.